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Name: Emily B.
Status: Student
Age: 17
Location: N/A
Country: N/A
Date: December 2002

If the nucleus is extracted from an adult animal cell and placed into an enucleated egg, how would it be possible to distinguish the cloned individual from the original?

It might be easy and might be difficult. For one, the new individual would be a different age than the donor. Also, there are some environmental factors that work on phenotype-think of genetic twins-they are not so identical that you cannot tell them apart. Also, if the clone is a female, there are some phenotypes that the result of X-inactivation.

For instance, last year a cat was cloned-they called it CC for copycat. But the clone did not look like her donor because the donor was a calico cat. Calico pattern is formed by random inactivation of one X chromosome or the other after the 32 cell of development in the embryo. So even though the kitty is genetically identical to the DNA donor, she does not look like her.


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